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V <br /> Area of specific modeling/design includes: <br /> ■ 32nd Avenue from Orchard Street to proposed Sinawik Park dry bottom detention <br /> basin and culverts under 32nd and Fulton Ave. <br /> ■ Fulton Avenue from outlet of proposed Detention Basin to Western Channel and <br /> proposed 33rd Ave. Relief Sewer to its outlet north of Maplewood <br /> • Conduct Rational Method and/or HY-8 pipe/culvert analyses to identify capacities and <br /> optimal geometry for ditches, drains, culverts or other public infrastructure necessary to <br /> address drainage issues identified in isolated locations where the recent Planning Study <br /> identified necessary improvements to alleviate ponding on private properties throughout <br /> the study area. <br /> • Prepare a Preliminary Engineer's Opinion of Cost. <br /> • Review results and detailed sizing recommendations with Public Works staff and <br /> incorporate revisions, alternatives, cost considerations and other input into a final <br /> preliminary plan for approval prior to starting final design. <br /> 4. Final Design /Construction Documents <br /> • Prepare a single set of plans and specifications for public bidding and selection of a <br /> contractor to perform the proposed drainage improvements. Construction Set will <br /> include: <br /> ■ Sealed cover Sheet with location maps and index <br /> ■ Plan and Profiles of proposed storm sewer improvements <br /> ■ Grading plans for all grading improvements, including dry bottom detention basin <br /> and relief sewer from Fulton Ave. to Maplewood Ave. <br /> ■ Grading plans and cross sections for ditch improvements on public ROW and <br /> connections to proposed relief sewer. <br /> ■ Culvert replacements, ditch grading plans <br /> ■ Typical sections <br /> ■ Details <br /> ■ Grading and Erosion Control Plans <br /> ■ Detention basin inlet and outlet details <br /> ■ Cross Road culvert plans, profile and associated details. <br /> • Specifications, utilizing MasterSpec templates modified to appropriate City of Decatur <br /> Standards. <br /> • Prepare an Engineer's Opinion of Cost. <br /> • Prepare IEPA Notice of Intent(NOI) and Stormwater Pollution Prevention Plan (SWPPP) <br /> for submission for NPDES Phase II Construction Permit. <br /> • Prepare and submit IDNR EcoCat Endangered Species Signoff Request and IHPA <br /> Historic Preservation Signoff Request as required for NOI Submission. <br /> Last Revised:04/29/2015 A- 2 <br />